Nexperia USA Inc. 74LVC594ABQ,115

Overview

74LVC594ABQ,115 from Nexperia is an 8-bit serial-in/parallel-out shift register with separate shift and storage registers, dual clock inputs (SHCP and STCP), active-low reset pins (SHR, STR), and Schmitt-trigger inputs. It operates from 1.2 V to 3.6 V, supports 3.3 V/5 V mixed-voltage interfacing, and delivers ≤7.7 ns propagation delay at 3.6 V for use in LED matrix drivers and industrial I/O expansion.

For engineers reviewing the 74LVC594ABQ,115 datasheet, 74LVC594ABQ,115 pinout, 74LVC594ABQ,115 application, or 74LVC594ABQ,115 equivalent, key selection criteria include its dual-register architecture enabling glitch-free output updates, IOFF partial power-down protection, and DHVQFN16 thermal-enhanced package for high-density PCB layouts.

Technical Context

The device implements two independent 8-stage synchronous registers: a shift register accepting serial data on SHCP rising edges and a storage register loaded on STCP rising edges-enabling asynchronous output latching. Its dual-reset architecture allows selective clearing of either register without affecting the other.

All inputs feature Schmitt-trigger action for noise immunity with slow-rising signals, and the IOFF circuit disables outputs during power-down to prevent backflow current. Overvoltage tolerance up to 5.5 V permits direct interfacing with 5 V logic while powered from 1.2–3.6 V supplies.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, 16-terminal leadless construction with exposed thermal pad, optimized for thermal dissipation and space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.

Compared with SN74HC595PWR and 74LVCH16374ADGG, the 74LVC594ABQ,115 uniquely combines serial loading, independent storage latching, and overvoltage-tolerant inputs - making it optimal for mixed-voltage, noise-prone, and timing-critical I/O expansion where output stability during data shifting is mandatory.

Availability

74LVC594ABQ,115 is available at Aetrix Electronics and suitable for LED matrix driver design, industrial I/O expansion, automotive body control units, and consumer remote control hubs requiring stable component supply across extended temperature ranges.

Supply support for 74LVC594ABQ,115 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets, with leadership in logic, discrete, and MOSFET technologies.

The 74LVC594A belongs to Nexperia's LVC logic family, engineered for low-voltage operation (1.2–3.6 V), mixed-signal compatibility, and robust performance in harsh environments - targeting space-constrained, thermally demanding, and safety-critical applications.

FAQ

Can the 74LVC594ABQ,115 operate with a 5 V supply?

No - the absolute maximum VCC is +6.5 V, but the recommended operating range is strictly 1.2 V to 3.6 V. While inputs tolerate up to 5.5 V, applying 5 V to VCC exceeds specification and risks parametric failure or reduced lifetime. Use only within the 1.2–3.6 V range for guaranteed functionality and reliability.

What is the purpose of the exposed thermal pad on the DHVQFN16 package?

Pin 1 index area and the exposed thermal pad (connected to GND internally) provide enhanced thermal conduction from the die to the PCB. Soldering the pad improves junction-to-board thermal resistance by up to 40 %, critical for maintaining <125 °C junction temperature under continuous 24 mA output loading at elevated ambient temperatures.

How does the IOFF feature protect the device during power-down?

When VCC drops to 0 V, the IOFF circuit forces all outputs into high-impedance state regardless of input voltages or clock activity. This prevents reverse current flow from externally driven outputs (e.g., 5 V signals on Q0–Q7) back into the unpowered IC, eliminating risk of latch-up or damage in multi-rail systems with asynchronous power sequencing.

Is cascading multiple 74LVC594ABQ,115 devices supported?

Yes - the Q7S serial output is designed for daisy-chaining: connect Q7S of one device to DS of the next. Cascading is guaranteed under identical VCC and temperature conditions, with propagation delays additive across stages. For 16-bit operation, two devices require coordinated SHCP and STCP signals shared across both packages.